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Fights Between Male Guinea Pigs

I have two male guinea pigs that are fighting. Should I get them neutered?

By Shannon Cauthen
Posted: April 1, 2008, 5 a.m. EDT

Q: I have two male guinea pigs (brothers) that I bought when they were young. They have lived together for a long time. One of them is larger and more dominant, and sometimes he tries to mount the other one. I'm not sure, but I believe this is causing them to fight. It's pretty violent but it doesn't last long, however, I'm afraid they will hurt themselves flying around the cage like that. Should I get one or both of them neutered?

A: Unfortunately neutering does not change the demeanor of guinea pigs as it might with other animals. Even if you were to have one or both guinea pigs neutered, this behavior would only continue when they where returned to the same cage.

The nature of the fighting, even if it occurs in short scraps, only intensifies as time passes. Even guinea pig littermates might fight each other until one is seriously injured or dead. Separate housing, even set side by side, offers a much healthier environment.
 
It’s difficult to determine whether guinea pig males will get along with each other. For a first introduction, place the guinea pigs in a clean area that neither has claim to. Expect them to pace around each other and sniff under each other’s chin or bottom. This possibly is a way for them to determine the friendliness of the other guinea pig. It is almost as if they are saying, “Hi, what is your ranking in the herd?” Not unlike dogs.

After this, guinea pigs usually move to what is called the "Purr, Rumble, Strut." One male circles the other while purring, rumbling and shaking his back end on the balls of his feet. Moving closer, he attempts to rub his scent on the other guinea pig from a scent gland located at the back of his bottom. Sometimes this gland is visible by a greasy substance that is secreted just above his bottom or about where a tail would be if a guinea pig had a visible tail.
 
Guinea pigs will then attempt to mount each other in a dominating posture. If one of the males allows the other male to do this and leave when he’s done, then the pair can likely be housed together. But there are no long-term guarantees.

Several progressive signals indicate when a pairing won’t work.

1. The males purr, rumble and strut around each other, but don’t give an inch to the other.
2. One or both guinea pigs yawn widely as if to say, “See my teeth! They could cause you some serous damage!”
3. One guinea pig head-butts or thumps the other. Sometimes the butting guinea pig comes back with a bit of hair in his mouth. This is a final warning; the next thump will be a bite.

If the guinea pigs are not separated at this point, a brawl begins. The fur flies, the bedding flies, and they become a whirl of flying fur, feet and teeth.

Keep a towel or gloves handy during introductions. If things go wrong, you can reach in with your hands protected. When guinea pigs reach the point of fighting, they do not pay attention to who is where and they may accidentally bite the hands that feed them. Ideally things would not be permitted to get to this point.

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Fights Between Male Guinea Pigs

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Reader Comments
My 2 oldest male guinea pigs, Cuddles, and Buba (brothers) used to get along fine, the one day they began fighting and it only got worse as time went on. It got to the point where our third guinea pig, hiccup, (also a male) would sit in the corner shaking, terrified, and wouldn't eat. We separated Cuddles, and Buba... We took cuddle s out of the cage and put hm in his own, but now he seems lonely, What do I do?
Kasey, Williamstown, WV
Posted: 11/28/2014 10:16:23 AM
I had 1 guinea pig for 5 years that lived happy in doors. When he died I brought 2 males & they was fighting all the time, so took 1 guinea pig back from where I got him and the other guinea pig lives happy on its own with lots of company and hugs from us . Would never put 2 male guinea pigs together no matter what the pet shop tells you the bite marks 1 of the guinea pigs did and the fighting was horrible .
Lisa, International
Posted: 11/25/2014 2:00:58 AM
Hello Giselle, The topic of fighting was revisited in another question and answer. Check out LINK Wishing all the best to you and your guinea pigs.
Marylou, Irvine, CA
Posted: 5/13/2014 10:27:16 AM
That article did not really answer the question. It only stated about when the males are first introduced. The person asking the question stated that they have been together for a long time now. I ask because I have been having the same problem the last few days. My boys (Oreo and Ashes) get along well 99% of the time. However, Oreo is definitely the dominant, and he has been humping and chasing and being kind of vicious towards his brother. I don't know if it's due to mating season or something? because this is brand new. I had to saparate them with a panel in the middle of the cage, and now Oreo is mad he cant get to Ashes anymore. Ashes looks a little more relieved now that he can have some peace. What is this?
Giselle, Bluffton, SC
Posted: 5/12/2014 7:35:39 PM
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